MONEY, THE INTEREST RATE, AND OUTPUT: ANALYSIS AND POLICY. Chapter 24

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1 1 MONEY, THE INTEREST RATE, AND OUTPUT: ANALYSIS AND POLICY Chapter 24

2 MONEY, THE INTEREST RATE, AND OUTPUT: ANALYSIS AND POLICY goods market The market in which goods and services are exchanged and in which the equilibrium level of aggregate output is determined money market The market in which financial instruments are exchanged and in which the equilibrium level of the interest rate is determined Only by analyzing the two markets together, we can determine the values of aggregate output (Y) and the interest rate (r) that are consistent with the existence of equilibrium in both markets 2

3 THE LINKS BETWEEN THE GOODS MARKET AND THE There are two key links between the goods market and the money market: 3 Link 1: Income and the Demand for Money Link 2: Planned Investment Spending and the Interest Rate

4 THE LINKS BETWEEN THE GOODS MARKET AND THE Link 1: Income and the Demand for Money Income, which is determined in the goods market, has considerable influence on the demand for money in the money market The demand for money depends on income (Y) An increase in output, with the interest rate (r) held constant, leads to an increase in money demand Link 2: Planned Investment Spending and the Interest Rate The interest rate, which is determined in the money market, has significant effects on planned investment in the goods market Planned investment spending (I) depends on the interest rate The higher the interest rate is, the lower the level of planned investment spending 4

5 THE LINKS BETWEEN THE GOODS MARKET AND THE 5 Links Between the Goods Market and the Money Market

6 THE LINKS BETWEEN THE GOODS MARKET AND THE INVESTMENT, THE INTEREST RATE, AND THE GOODS MARKET Investment refers to a firm s purchase of new capitalnew machines and plants Whether firm decides to invest in a project depends on whether the expected profits from the project justify its costs-that is the interest cost When the interest rate rises, it becomes more expensive to borrow and fewer projects are likely to be undertaken; increasing the interest rate is likely to reduce the level of planned investment spending Reducing the interest rate is likely to increase the level of planned investment spending 6

7 THE LINKS BETWEEN THE GOODS MARKET AND THE 7 INVESTMENT, THE INTEREST RATE, AND THE GOODS MARKET When the interest rate falls, planned investment rises. When the interest rate rises, planned investment falls. Planned Investment Schedule

8 8 THE LINKS BETWEEN THE GOODS MARKET AND THE We can know use the fact that planned investment depends on the interest rate to consider how this relationship affects planned aggregate expenditure (AE) AE C+I+G When the interest rate (r) changes, planned investment (I) changes A change in the interest rate (r) will lead to a change in total planned spending (C+I+G) as well

9 THE LINKS BETWEEN THE GOODS MARKET AND THE 9 The Effect of an Interest Rate Increase on Planned Aggregate Expenditure

10 THE LINKS BETWEEN THE GOODS MARKET AND THE The effects of a change in the interest rate include: High interest rate (r) discourages planned investment (I) Planned investment is a part of planned aggregate expenditure (AE) Thus, when the interest rate rises, planned aggregate expenditure (AE) at every level of income falls Finally, a decrease in planned aggregate expenditure lowers equilibrium output (income) (Y) by a multiple of the initial decrease in planned investment Using a convenient shorthand: r I AE Y r I AE Y 10

11 THE LINKS BETWEEN THE GOODS MARKET AND THE The other half of the story The ways in which the goods market affects the money market We explored the demand for money by households and explained why the demand for money depends negatively on the interest rate An increase in the interest rate raises the opportunity cost of holding money, encouraging people to keep more of their funds in bonds and less in checking account balances Downward sloping money demand curve 11

12 THE LINKS BETWEEN THE GOODS MARKET AND THE The demand for money also depends on the level of income An increase in income shifts the money demand curve to the right We assume that the Central Bank s choice of amount of money to supply does not depend on the interest rate The money supply curve is a vertical line The equilibrium interest rate is the point at which the quantity of money demanded equals the quantity money supplied If MS>MD, excess supply of money, interest rate will fall If MS<MD, excess demand for money, interest rate will rise 12

13 THE LINKS BETWEEN THE GOODS MARKET AND THE 13 MONEY DEMAND, AGGREGATE OUTPUT (INCOME), AND THE Equilibrium in the Money Market

14 THE LINKS BETWEEN THE GOODS MARKET AND THE What will happen to the interest rate when there is an increase in aggregate output (Y)? The increase in Y will cause the money demand curve to shift to the right With a fixed supply of money, there is now an excess demand for money (MD>MS) at the initial interest rate This causes the interest rate to rise 14

15 THE LINKS BETWEEN THE GOODS MARKET AND THE 15 The Effect of an Increase in Income (Y) on the Interest Rate (r)

16 THE LINKS BETWEEN THE GOODS MARKET AND THE 16 The equilibrium level of the interest rate is not determined exclusively in the money market Changes in aggregate output (income) (Y), which take place in the goods market, shift the money demand curve and cause changes in the interest rate With a given quantity of money supplied, higher levels of Y will lead to higher equilibrium levels of r Lower levels of Y will lead to lower equilibrium levels of r, as represented in the following symbols: Y M d r Y M d r

17 17 COMBINING THE GOODS MARKET AND THE The link between the goods market and the money market To see how the two markets interact, it will be convenient to consider the effects of changes in fiscal and monetary policy on the economy What happens to the equilibrium level of aggregate output (Y) and the interest rate (r) when certain key variables - government spending (G), the taxes (T) and money supply (MS) increase or decrease

18 COMBINING THE GOODS MARKET AND THE EXPANSIONARY POLICY EFFECTS expansionary fiscal policy An increase in government spending or a reduction in net taxes aimed at increasing aggregate output (income) (Y) expansionary monetary policy An increase in the money supply aimed at increasing aggregate output (income) (Y) 18

19 COMBINING THE GOODS MARKET AND THE Expansionary Fiscal Policy: An Increase in Government Purchases (G) or a Decrease in Net Taxes (T) Two tools of government fiscal policy Government spending (G) Net taxes (T) The government can increase aggregate output (Y) either by Increasing government purchases Reducing net taxes 19

20 COMBINING THE GOODS MARKET AND THE Consider an increase in government purchases (G) This increase in expenditure causes firms inventories to be smaller than planned Unplanned inventory reductions stimulate production and firms increase output (Y) Added output means added income, some of which is spent, consumption spending also increases (C) Again, the inventories will be smaller than planned and output will rise even further The final equilibrium level of output is higher by a multiple of the initial increase in G 20

21 COMBINING THE GOODS MARKET AND THE However, the multiplier story is incomplete We previously assumed that planned investment (I) is fixed at certain level, but we now know that planned investment depends on the interest rate 21 Return to the multiplier story The stage that firms begin to raise output in response to an increase in government purchases

22 COMBINING THE GOODS MARKET AND THE As aggregate output (Y) increases, the increase in income increases the demand for money We still assume that money supply is constant The resulting disequilibrium, with the quantity of money demanded greater than the quantity of money supplied, causes the interest rate to rise The increase in G increases both Y and r 22

23 23 COMBINING THE GOODS MARKET AND THE The increase in r causes planned investment spending (I) to decline As planned investment spending is a component of planned aggregate expenditure (C+I+G), the decrease in (I) works against the increase in G An increase in G increases planned aggregate expenditure and increases aggregate output A decrease in (I) reduces planned aggregate expenditure and decreases aggregate output

24 24 COMBINING THE GOODS MARKET AND THE crowding-out effect The tendency for increases in government spending to cause reductions in private investment spending Without any expansion in the money supply to accommodate the rise in income and increased money demand, planned investment spending partially crowded out by the higher interest rate The extra spending created by the rise in G is somewhat offset by the fall in (I) Income still rises, but the multiplier effect of the rise in G is lessened because of the higher interest rate s negative effect on (I)

25 COMBINING THE GOODS MARKET AND THE 25 The Crowding-Out Effect

26 COMBINING THE GOODS MARKET AND THE An increase in government purchases from G 0 to G 1 shifts the planned aggregate expenditure curve (C +I 0 +G 0 ) upward (C+I 0 +G 1 ) The increase in (Y) from Y 0 to Y 1 causes the demand for money to rise, which results a disequilibrium in money market The excess demand for money raises the interest rate, causing I to decrease from I 0 to I 1 The fall in I pulls the planned aggregate expenditure curve back down (C+I 1 +G 1 ), which lowers the equilibrium level of income to Y* 26

27 COMBINING THE GOODS MARKET AND THE 27 Effects of an expansionary fiscal policy: G Y M d r I Y increases less than if r did not increase

28 COMBINING THE GOODS MARKET AND THE What about the changes in net taxes? The expansion of Y that a tax cut brings about will lead to an increase in the money demand and the interest rate and thus a decrease in planned investment spending The ultimate increase in Y will be less than it would be if the interest rate did not rise 28

29 COMBINING THE GOODS MARKET AND THE Expansionary Monetary Policy: An Increase in the Money Supply Central Bank decides to increase the supply of money through open market operations Open market operations inject new reserves into the system and expand the quantity of money supplied The money supply curve shifts to right Because the quantity of money supplied is now greater than the amount households want to hold (MS>MD), the equilibrium rate of interest falls Planned investment spending increases when the interest rate falls 29

30 COMBINING THE GOODS MARKET AND THE Increased planned investment spending means planned expenditure is now greater than aggregate output Firms experience unplanned decreases in inventories and they raise output (Y) An increase in the money supply decreases the interest rate and increases Y However, the higher level of Y increases the demand for money The demand for money curve shifts to right This keeps the interest rate from falling as far as it otherwise would 30

31 COMBINING THE GOODS MARKET AND THE 31 Effects of an expansionary monetary policy: M s r I Y M d r decreases less thanif d M did not increase

32 COMBINING THE GOODS MARKET AND THE 32 Expansionary Fiscal Policy Accommodated by Increasing the Money Supply

33 COMBINING THE GOODS MARKET AND THE CONTRACTIONARY POLICY EFFECTS Contractionary Fiscal Policy: A Decrease in Government Spending (G) or an Increase in Net Taxes (T) contractionary fiscal policy A decrease in government spending or an increase in net taxes aimed at decreasing aggregate output (income) (Y) Opposite of the effects of an expansionary fiscal policy 33

34 COMBINING THE GOODS MARKET AND THE A decrease in government purchases or an increase in net taxes leads to a decrease in aggregate output (Y), a decrease in the demand for money and a decrease in the interest rate (r) The decrease in Y that accompanies a contractionary fiscal policy is less than it would be if we did not take the money market into account The decrease in r also causes planned investment (I) to increase This increase in (I) offsets some of the decrease in planned aggregate expenditure brought about by the decrease in G 34

35 COMBINING THE GOODS MARKET AND THE 35 Effects of a contractionary fiscal policy: G or T Y M d r I Y decreases less than if r did not decrease

36 COMBINING THE GOODS MARKET AND THE Contractionary Monetary Policy: A Decrease in the Money Supply contractionary monetary policy A decrease in the money supply aimed at decreasing aggregate output (income) (Y) As money supply decrease, interest rate increases, planned investment spending decreases Lower equilibrium level of income results in a decrease in the demand for money, which means that the increase in the interest rate will be less than it would be if we did not take the goods market into account 36

37 COMBINING THE GOODS MARKET AND THE 37 Effects of a contractionary monetary policy: M s r I Y M d r increasesless thanif d M did not decrease

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